A Theorem about the Algebraic Structure underlying Orthogonal Graph Invariants. - Oswaldo Araujo; Daniel A. Morales (J. Chem. Inf. Comput. Sci., 1996)

Properties of New Orthogonal Graph Theoretical Invariants in Structure-Property Correlations. - Oswaldo Araujo; Daniel A. Morales (J. Chem. Inf. Comput. Sci., 1998)

Bounds for the Randi Connectivity Index. - Ivan Gutman; Oswaldo Araujo; Daniel A. Morales (J. Chem. Inf. Comput. Sci., 2000)

Matchings in starlike trees. - Ivan Gutman; Oswaldo Araujo; Juan Rada (Appl. Math. Lett., 2001)

Vertex and Edge Type Relations of Randic Index for Chemical Trees. - Oswaldo Araujo; Juan Rada (Ars Comb., 2002)

Higher order connectivity index of starlike trees. - Juan Rada; Oswaldo Araujo (Discret. Appl. Math., 2002)

The higher-order matching polynomial of a graph. - Oswaldo Araujo; Mario Estrada; Daniel A. Morales; Juan Rada (Int. J. Math. Math. Sci., 2005)